依赖
先下载go-sql-driver/mysql
:
go get -u github.com/go-sql-driver/mysql
数据库
建表:
CREATE TABLE `data` ( `id` bigint(10) NOT NULL AUTO_INCREMENT, `key` varchar(1024) COLLATE utf8mb4_bin DEFAULT NULL, `value` varchar(1024) COLLATE utf8mb4_bin DEFAULT NULL, `create_time` timestamp NULL DEFAULT CURRENT_TIMESTAMP, `update_time` timestamp NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=36 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
实现代码:
实体对象
func (data Data) String() string { return fmt.Sprintf("id:%d key:%s value:%s\n[createTime:%d updateTime:%d]\n", data.Id, data.Key, data.Value, data.CreateTime.Unix(), data.UpdateTime.Unix()) } type Data struct { Id int64 Key string Value string CreateTime time.Time //[]uint8 UpdateTime time.Time //[]uint8}
获得连接
db, err := sql.Open("mysql", "dubby:123456@tcp(127.0.0.1:3306)/go_test?parseTime=true")if err != nil { panic(err.Error()) }
删除
func Delete(id int64, db *sql.DB) error { stmtOut, err := db.Prepare("DELETE FROM `data` WHERE id = ?") if err != nil { panic(err.Error()) } defer stmtOut.Close() result, err := stmtOut.Exec(id) if err != nil { panic(err.Error()) } if rowNum, err := result.RowsAffected(); err != nil || rowNum != int64(1) { panic("delete error") } return nil}
新增
func Insert(key string, value string, db *sql.DB) *Data { stmtOut, err := db.Prepare("INSERT INTO `data` (`key`, `value`) values (?, ?)") if err != nil { panic(err.Error()) } defer stmtOut.Close() result, err := stmtOut.Exec(key, value) if err != nil { panic(err.Error()) } id, err := result.LastInsertId() if err != nil { panic(err.Error()) } return QueryById(id, db) }
更新
func UpdateById(id int64, key string, value string, db *sql.DB) *Data { stmtOut, err := db.Prepare("UPDATE `data` SET `key`=?, `value`=? WHERE `id`=?") if err != nil { panic(err.Error()) } defer stmtOut.Close() _, err = stmtOut.Exec(key, value, id) if err != nil { panic(err.Error()) } return QueryById(id, db) }
根据ID查询
func QueryById(idRequest int64, db *sql.DB) *Data { stmtOut, err := db.Prepare("SELECT * FROM `data` WHERE id = ?") if err != nil { panic(err.Error()) } defer stmtOut.Close() rows := stmtOut.QueryRow(idRequest) data := new(Data) err = rows.Scan(&data.Id, &data.Key, &data.Value, &data.CreateTime, &data.UpdateTime) if err != nil { panic(err.Error()) } return data }
根据ID范围查询
func QueryByIdRange(minId int64, maxId int64, db *sql.DB) []*Data { stmtOut, err := db.Prepare("SELECT * FROM `data` WHERE id >= ? AND id <= ?") if err != nil { panic(err.Error()) } defer stmtOut.Close() rows, err := stmtOut.Query(minId, maxId) if err != nil { panic(err.Error()) } var result []*Data for rows.Next() { data := new(Data) err = rows.Scan(&data.Id, &data.Key, &data.Value, &data.CreateTime, &data.UpdateTime) if err != nil { panic(err.Error()) } result = append(result, data) } return result }
测试
fmt.Println("========QueryById========") data := QueryById(2, db) fmt.Println(*data) fmt.Println("========QueryByIdRange========") resultList := QueryByIdRange(1, 10, db)for i := 0; i < len(resultList); i++ { fmt.Println(*resultList[i]) } fmt.Println("========Insert========") data = Insert("go_key", "go_value", db) fmt.Println(*data) fmt.Println("========Delete========") err = Delete(data.Id, db) fmt.Println(err) fmt.Println("========UpdateById========") data = QueryById(2, db) prefix := fmt.Sprintf("update-%d-", time.Now().UnixNano()/1000%10000) data = UpdateById(data.Id, prefix+"dubby", prefix+"www.dubby.cn", db) fmt.Println(*data)
测试结果
========QueryById========id:2 key:update-5469-dubby value:update-5469-www.dubby.cn [createTime:1539340810 updateTime:1539345474] ========QueryByIdRange========id:2 key:update-5469-dubby value:update-5469-www.dubby.cn [createTime:1539340810 updateTime:1539345474]id:3 key:dubby value:dubby.cn [createTime:1539340810 updateTime:1539340810]id:4 key:test value:test [createTime:1539343652 updateTime:1539343652]id:5 key:test value:test [createTime:1539343760 updateTime:1539343760]id:6 key:go_key value:go_value [createTime:1539343942 updateTime:1539343942]id:7 key:go_key value:go_value [createTime:1539343956 updateTime:1539343956]id:8 key:go_key value:go_value [createTime:1539343977 updateTime:1539343977]id:9 key:go_key value:go_value [createTime:1539343981 updateTime:1539343981]id:10 key:go_key value:go_value [createTime:1539343982 updateTime:1539343982] ========Insert========id:35 key:go_key value:go_value [createTime:1539355099 updateTime:1539355099] ========Delete======== <nil> ========UpdateById========id:2 key:update-8738-dubby value:update-8738-www.dubby.cn [createTime:1539340810 updateTime:1539355099]
作者:我是杨正
链接:https://www.jianshu.com/p/24d35ea869d6
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